Selector



May 27, 1930. D. J. STEWART 1,760,379

- SELECTOR Filed 'Sept. 12, 1927 5 Sheets-Sh eet, 1'

-1 HI w I /09 i my /07 mh V INVENTOR Duncan J. (Stewart Y BY "f0 LINE ATTORNEYS 9 7; I930. D. J. STEWART 1,760,379

SELECTOR Filed Sept. 12, 1927 5 Sheets-Sheet 5 F l I i 66 66 i I I V m7 W5 1 W m I 70/ 73 Ma w 103 I42 /45 m5 m4- INVENTOR Duncan 1]. Sic-war]? \JULJWU m {MM/ 34mm ATTORN EYS May 27, 1930. D. J; s'rEwAT 1,750,379

SELECTOR Filed Sept 12, 1927 '5 Sheets-Sheet 4 INVENTOR Duncan J. Siqwari ATTORNEYS y 27, D. J. STEWART 1,760,379

SELECTOR Filed Sept. 12. 1927 5 Sheets-Sheet 5 INVENTOR 7 Duncan J Jiewari ATTORN EYS Patented May 27, 1930 TATES uncan J. STEWART, or ROCKFORD, ILLINoIs, AssIeNoB 1'0 HOWARD 1). com, on

ROCKFORD, ILLINoIs SELECTOR Application filed September 12, 1927. Serial No. 218,985.

Another object is to provide a novel signal responsive selector having a plurality of socalled code bars mounted for bodily movement and presentment successively to a. selectively controllable pushing device and a combination member movable with said bars and normally locked against .movement by the bars but adapted to be freed for movement by the setting of the bars in a particular combination.

Still another object is to provide a rotary selector unit having a plurality of notched code bars adapted in the rotationof the unit to be set by signal controlled means for effecting the selective operation of a' plurality of different control devices.

Other objects and advantages of the invention will become apparent from the following detailed. description taken in connection with the accompanying drawings in which: I v

- Fig. 1 is a front elevational view of the signal receiving mechanism having a selector embodying the features of the present invention.

Fig. 2 is a schematic view of the signal control circuits for controlling the operation of the selector.

Fig. 3 is an elevational view taken from the right hand side of the mechanism shown in Fig. 1.

- Fig. 4 is a sectional view taken along line 44 of Fig. 1.

Fig. 5 is a fragmentary pushing device employed.

Fig. 6 is'an elevational view taken from the left-hand side of the mechanism shown in Fig. 1.

Figs. 7 and 8 are plan and elevational views detail view of theof the contactmechanism controlled by the selector unit.

Fig. 9 is a perspective view of the selector unit and its mounting.

Figs. 10 and 11 are fragmentary perspective views showing details of the selector mechanism. p

Figs. 12 and 13 are detail perspective views of a mechanism for controlling the signal receiving circuits.

Figs. 14 and 15 show developments of elements of the selector. N

Fig. 16 is a plan sectional view taken along the line 1616 of Fig. 1. p b Fig. 17 is a detail view of one of the code ars.

Fi 18 is a fragmentary schematic view of certain parts of the. selector.

While the invention'is susceptible of various modifications and alternative constructions, I have shown in the drawin s and will herein describe in detail the preferred embodiment, but it' is to be understood that I do not thereby intend to limit the invention to the specific form disclosed, but intend to cover all modifications and alternative constructions falling within the spirit and scope of -.the invention as expressed in the appended drawings in a form which is particularly adapted for use in a radiant energy signaling system which forms the subject matter of a copending application Serial No. 188,856 filed May 4, 1927 by Howard D. Colman.

This particular signaling system is intended primarily for eflecting the control from a remote point of an instrnmentality such as a garage, door operator, and comprises generally a device on a motor vehicle adapted to transmita predetermined codal combination of radiant energy impulses and space units and a mechanism located in the garage or other suitable place for receiving these signal units and operating when the proper combination of units is received to initiate the operation of a power driven operator for openin or closing the garage door. Preferabl sai receiving mechanism is of the so-ca ed start-stop type commonly employed in telegraphic signaling and is composed of a suitable signal detecting circuit and a selector mechanism whose 0 eration for a complete signal cycle is initiated by the reception of the-initial impulse of the signal combination, the remaining impulses and space units of the combination being used to control the setting of a plurality of selecting elements. The arrangement of these elements determines the character of the selection to be efiected subsequently.

' Generally stated, the selector proper comprises a rotatable drum adapted to be driven through one complete revolution in each signal cycle during which a plurality of socalled code bars individually movable on the drum are presented successively to a pusher which positions them in accordance with the character of. the several units of the received signal. If the code bars are set in 'a certain combination,-one or more so called combination members carried by the drum will be permitted to move relative to the drum at the completion of the signal cycle. Movement of one combination member operates the desired instrumentality or control device which in the present instance is one of a plurality of switches.

In the present instance, the selector drum includes a horizontal shaft 20 journaled in sprlit bearings on two standards 21 and 22 ig. 1) upstandin from a base frame 23. Fast upon the sha between the standards are four flat metal disks 24, 25, 26 and 27' keyed or otherwise fixed to the shaft 20 and held in spaced relation by sleeves 28. These disks constitute supports for a plurality of code bars numbered from 29 to 42 inclusive (Fig. 14) and arran ed for individual endwise movement on t e drum into either of two set positions. To this end, the'bars are cut from flat. strips of sheet metal and extend loosely through alined apertures 43 (Figs. 9 and 10) in the disks 24, 25 and 26. Thus each bar is positioned parallel to the axis of the shaft 20 in a plane including the axis of the shaft.

To hold the bars yieldably in what will be hereinafter called normal osition as distinguished from their shifted posit-ions into which the bars may be moved by a pusher to be described later, each bar is disposed in a radially extending notch 44 in the disk 27 (Fig. 4) and is formed at its inner edge with two adjacent notches 45 (Fig. 17 ada ted to engage the bottom of the notch in t e disk 27. Such engagement is maintained by a light tension spring 46 acting between one end of the code bar and a wire ring 47 (Fig. 4 encircling the shaft 20. The

code bars are t us adapted for bodily moveagainst oscil will be seen that when all of the code bars in 'ment transversely of their lengths and each shoulders formed on the spacer sleeves 28 by which the disks are held in spaced parallel relation. Each combination disk is thus adapted for oscillatory movement about the axis of the shaft 20, the extent of which movement is determined by the length of arcuate slots 52 (Fig. 4) in the disks which receive a cross rod 53 carried by the stationary disks. I

For purposes, which will appear later the disks 49 and 50 are located between the stationary disks 25 and 26 while the disks 48 and 51 are positioned adjacent the disks 24 and 27 respectively.

The code bars are received in radial notches 54 formed in the peripheral edge of each combination disk and therefore act normally to lock the disks a ainst oscillation relative to the stationary isks. However, the construction of the code bars is such that when they are set in the proper combination one or more of the movable disks will be unlocked for movement about the shaft, the desired selection being thereby made. For this purpose, each code bar is formed along its inner edge with four squared notches (Figs. 14, 15 and 17) which are slightly wider than the combination disks and deeper than the notches therein. When any code bar is positioned with one of its notches in the plane of a combination disk that code bar will no lon er hold the com ination disk atory movement. Therefore, it

the series are positioned so that one notch of each registers with one of the combination disks, that disk will be free to oscillate about the shaft 20. However, if any one bar 1s not properly set the disk will be locked against movement.

Four different kinds of code bars are pro vided in the present instance, one kind being exemplified, by the bars 29, 31, 33, 3'5, 38, 39 and 40 (see Figs. 14 and 17). ese bars have four notches 55 and 56,the notches 55 being in register with the combination disks 48 and 50 when'the bars are in shifted position as shown in Fig. 14 while the notches 56 are out of register with the disks 49 and 51 for the same position but in register therewith when the bars are in normal position. Similarly the bars 30, 32, 34, 36 and 37 have notches 57 which register with the disks 49 and 51 when the bars are in shifted position (Fig. 15) and notches 58 which re ister with the disks 48 and 50 only when the bars are in I position of the movable disks, the notches kinds of bars numbered'41 and 42, are formtween the cross rod 53 and a ed with double width notches 59 and 60 which 'always'register with the disks 48 and 49 respectively and therefore never look these disks against movement. The bar 41 has two other notches 61 and 62which operate respectively to lock the disk 51 and unlock the disk 50 when the bar is in normal position (Fig. 14) and lock the disk 50 and unlockthe disk 51 when the bar is shifted (Fig. 15). Similar notches 63 and 64 are provided in the bar 42.

- As shown particularly in Fig. 4 each of the disks 48, 49, 50 and 51 is drawn forwardly, that is, in the direction of rotation of the drum by means of a spring 65 acting bepoint on the disks thereby serving to hold the trailing end of the slots 52 against the rod 53. In this therein register with the code bars so as to permit longitudinal movement of the latter.

The means for rotating the selector drum comprises, in the preferred embodiment, a

vibratory electric motor adapted tobe driven at synchronous speed through one revolution of the drum durmg each signal. cycle. Preferably the motor comprises a pair of magnetic coils 66 whose pole pieces 67 are rigidly suspended from an arm 68 projecting horiz ontally from a standard 69 on the frame base 23. Adj ustably mounted on arms 70 depend ing from the arm 68 are two spring members 71 which support a laminatedarmature 72 opposite the lower ends of the pole pieces 67. This armature carries a pawl 73, the free end of which is normallyheld in engagement with a small ratchet wheel 74 by a spring arm 7 4 A spring retaining pawl 75 engages the ratchet wheel and holds it against reverse rotation. The ratchet wheel is fast upon a shaft 7 6 journ'aled at its opposite ends in bearing arms'77 and carrying a worm 78 which meshes with a worm wheel 79 on the extended end of the drum shaft 20. Vibration of the armature 72 by alternately energizing and deenergizing the coils 66 operates through the connection above described to rotate the drum shaft at a relatively slow and uniform speed. With this typeof motor and its driving connection, the drum may be started and stopped substantially instantaneously thereby making it possible to determine the extent of the rotation ofthe drum with the desired accuracy. 7

, Alternate energization and deenergization of the magnet coils 66 is effected by the ap:

plication thereto of alternating current power. To control the application of the power, the coils 66 are arranged in series relationandone is connected by a conductor 80 (Fig. 2) to one line 81 from the source of alternating current. The other coil is adapted for connection with the other power line maintaining a continuous connection between I the coils and the power lines.

To close the switch 86 upon the initial movement of the selector drum and open it after one revolution thereof, a disk 87-having a notch 88 therein is made fast upon the shaft 20 adjacent the worm wheel 79. Herein the peripheral portion of the disk bears against a spring follower 89 carryin one contact of the switch 86 and presses thls contact against another contact on a spring arm 90 (Figs. 12 and 13) except when the shaft 20 is at restafter the completion of a signal cycle. In this position (Fig. 13), the end of the follower 89 drops into the notch 88' andallows the switch,86 to open. As shown in Fig. 16, the spring arms 89 and 90 are mounted on an insulating block 91 secured to the base 23.

In the rotation of the drum during each signal cycle the code bars are presented successively to a pusher which operates under the control of the received signal units to move the bars endwise into shifted position or to allow them to remain in normal position according to the character of the different signal'units corresponding to the respective the bars endwise is derived from the rotation of the selector drum, the application of such power being controlled by a signal responsive device to be later described.

The pusher comprises a light sheet metal member92 which may be termed a plow and T I which has two spaced ears formed at one of its ends and pivoted on a vertical pin 93. As

shown in Figs. 5 and 9, the pin is supported by a bracket 94 secured to the frame standard 22 and carries a light coil spring 95 acting to swing the plow toward the disk 24. At its free end the plow is formed with an inclinedportion 96 (Figs.' 14 to 16) which is normally disposed in the path of the ends of the code bars.

Because of the tendency of the springs 46 to hold the code barsin normal or shifted positions, movement of the bars by engagementwith the plow 92 is resisted and this resistance is sufiicient to overcome the action of the spring 95. Therefore unless the plow is restrained against pivotal movement when a bar in normal position is presented, the spring 95 will yield and permit the plow to move out of the path ofthe bar. In case the plow is restrained against pivoting when a code bar is presented, the inclined portion 96 acts as a cam on the end of the bar and causesthe bar to be pushed from normal to shifted position. i

During each revolution of the selector drum 5 each code bar which is in shifted position as a result of having been pushed in the previous signal cycle is moved back to normal position just prior to its presentment to the pushen- As 1s best shown in Fi 16, the means for thus resetting the code are comprises a stationary cam 97 whose face is located at the end of the drum op osite the pusher and in position to engage 't e ends of the code bars. This cam is formed on a plate 5 98 secured u on the frame standard 21.

p In order t at the code bars will be set during each signal cycle in a combination corresponding to the arrangement of units in the received signal, means is rovided for so controlling the movements of t e pusher so that if a si al unit of one character is re ceived the p ow will be restrained against ivotal movement and the code bar therea ter presented will be moved from normal to shiftas ed position. On the other hand, if the signal unit is of a difier'ent character, the plow will be free to move out of engagin relation with the niode bar. The means erein employed for a complishin these results into cludes a control finger 99 Fig. 5) which is adapted for movement vertically into and out of the space between a lateral lug 100 on the plow and a fixed abutment provided bya plate 101. When in blocking relation, as 85 shown in Fi 5, the finger prevents pivotal movement 0 the plow as the latter is engaged b one ofthe code bars, the result bein that t e barthen engaging the plow is shifte endwise by the force resultin from the continued forward movement 0 the drum.

In the present instance, the finger 99 is in the form of a lug depending from the side edge of a plate 102 carried by'an arm 103 which pro ects rearwa-rdly from the armature 104 of a sensitive electromagnet having coils 105. As'shown in Figs. 5 and 16, the plate 101 is secured upon the ri ht hand frame standard 22 with one side e ge projecting therefrom just above the level of the lug 100 and terminating at such a distance from the end of the lug as to allow for movement of the fin er 99 1nto and out of blockin position. e armature 1041s supported 5y pivots 106 on arms 107 which pro ect downwardly from an overarm 108 secured to the frame standard 69. This arm also supports the magnet coils 105 through the medium of their file pieces 109. A light spring 110 acting tween the arm 103 on the armature and a leaf spring 111 (Fig. 3) tends to swin the armature away from the pole pieces 109 t ereby tending to raise the control fin er 99 out of locking sition. Preferabl t e spring 110 is relatlvely short in lengt so that its ll tension will change rapidly to conform to 1 is pressed down against the plate 101 with withthe inppt or controlling circuit 1170f a filament of the tube'is heated continuously,

124 to one terminal of the mega changes in the attractive force of the electromagnets 105 on the armature which force decreases rapidl as the air gap between the armature and t e pole pieces is widened. Thus the spring tension is atest when the air gap is narrow and sma lest when the air gap 1s wldest and the attractive force is small.

he magnet therefore is extremely sensitive.

Normally, that is,-when no signal impulses are being received the magnet coils 105 remain energized by means to be later described, the armature 104 being thereby drawn u wardly against the action of the spring 1 0 with the result that the arm 103 i the control-finger in blocking position between the In on the plow and the abutment forme by the edge of the plate 101. Accordingl w an the magnet coils are deenergized, the finger 99 is raised by the action of the sprin so that the lug 100 is free to move un er the plate 101 when. a code bar on the rotating drum engages and swings the plow. In order that t e control finger cannot'be withdrawn after a code bar has once engaged the glow and is thereby being positioned accor mg to the position of the control finger atthe time of such engagement, the end of the lug 99 is formed with an inclined surface 112 (Fig. 5) which is adapted to cooperate with the inclined end ortion 113 of the control finger. Thus, the area due to the reaction of a code bar. on the plow while the bar is being pushed thereby serves to press the surfaces 112 and 113 together with the result that the control finger will be held in blocking position until the bar has passed the plow even though the magnet coils do become deenergized while the bar is still in operative position with respect to the plow.

The means for detecting the transmitted signals and controlling the magnet 105 ac,- cording to the character of the individual units, 1s shown diagrammatically in Fig. 2,. andcomprises a grounded circuit 114 having an antenna 115 therein. This circuit is associated by means of an inductive coupling 116 detector tu 118 which circuit includes the grid 119-and filament 120 of the tube. For the purpose of tuning the control circuit, a variable condenser 121 is connected across the secondary coil of the coupling 116. The

120 the source of alternating current being used for this purpose through the medium of a step-down transformer 122.

The plate or control circuit of the tube includes a conductor 123 connecting the plate et coil 105, the other terminal of the coil bemg connected 'by a conductor 125 to the conductor 80 and thence to power line 81. A conductor 126 between the power line 82 and the filament I 120 completes the plate circuit. Alternating i a voltage is thus impressed across the plate and filament but the current in the plate circuit ture 104 of the magnet being thereby drawn.

upwardly to press the control finger downwardl into blocking position. When a train of ra iant energy waves constituting an impulse of the signal is detected, negative charges are produced on the grid 119 which causes the current in the plate circuit to del crease sufficiently to deenergize the magnet reception of a radiant energy impulse, the

105 thereby causing the control finger to be withdrawn from blocking position.

The leakage resistance between the filament and the grid of the vacuum tube is kept as high as practicable in order that relatively weak signals can be detected. Therefore,

after the magnet has been deenergized by the negative charges caused thereby are retained on the grid so that before the succeeding unit of the signal, which may be a space unit in stead of an impulse, can be eflective to control the setting of the next code bar, to be presented to the pusher, it is necessary to recondition the tube and thereby energize the control magnet 105. This is accomplished by discharging the grid of the tube just after each code bar'has engaged the plow and been controlled thereby. To this end, a wheel 127 is made fast upon the shaft 20 and formed with a plurality of teeth 128which engage a follower 129 and periodically close'a switch 130 during each signal cycle. One contact of theswitchcomprises a spring arm 130 (Fig. 6) and is carried by the follower 129 line .82 through a conductor 131 (Fig. 2).

The other switch contact is on a binding post 132 connected to the conductor 117. 1 There is one tooth 128 on the grid discharge wheel 127 corresponding to eachcode bar on the selector drum each tooth being positioned with respect to the selector drum so that it will, in the rotation of the shaft 20, reach the end of the follower 129 just after a code bar has engaged the'plow 92 and is being controlled in accordance with the position v of the control finger 99 at the time of such engagement. This relation is shown schematically in Fig. 18. Closure of the grid discharge switch is only momentary owing to the shortness of the teeth 128. After the termination of each grid discharge, the tube will be in condition to respond to the next signal unit whether it is an impulse or a space unit. In this way, the'signal cycle is divided up into a plurality of control periods during which an impulse may be received to properly control the code bars corresponding to the respective periods. Each period occupies thetimeintervalbctween the termination of the grid discharge and the engagement between the-plow and the code bar next to be presented to the plow after, openin of the switch 130. If an impulse is receive at any time during one of these periods whether near the beginnin or the end of the period,

it will withdraw t e control finger and allow 1 the code bar to pushed. I

Breaking of the running circuit of the driving motor by opening of the switch 86 at the end of the signal cycle causes a radiant energy field to be created by electromagpass the plow without being netic induction around the receiving circuit,

the tendency of which would be to deenergize the magnets and start the motor for another cycle by'closing the starting switch 85. To obviate this difficulty, means is provided for rendering the receiving circuit inoperative at the time the switch 86 is opened, this being accomplished .in the present instance.

by continuing the last grid discharge of each signal cycle until after the switch 86 has been opened. This means (Figs. 12 and 13) includes a disk 133 loosely mounted on the shaft 20 adjacent the wheel 127 and having a'lost motion connection 133 (Fi 6) with the wheel 127. A spring 13 1 ig. 6) tends to oscillate the disk 133 in the direction of rotation of the shaft and thereby normally 7 holds the disk in the position shown in Fig. 13. The disk 133 has a lug formed with an arcuate surface 135 located substantially the same distance from the axis of the shaft 20 as an elongated tooth 136 on the wheel127, the trailing edge of which tooth terminates the last grid discharge. The follower 129 is wide enough to contact the surface 135 and also the tooth 136. which is connected to the grounded power Projecting laterally from the lug on the disk 133 is an arm 137 which engages a lug 138 on the follower 89 near the end of the signal cycle, the follower being at this time in contact with the raised peripheral portion of the disk 87. Thus, the lug 138 constitutes a stop which holds the disk 133 back so that the surface 135 prevents opening of the grid discharge switch even though the trailing end of the tooth 136 may have been carried beyond the end of the follower 129. However, when the end of the follower 89 drops into the notch 88 to open the motor circuit, the lug 138 thereon moves out of thepath of the arm 137 and frees the disk 133 for movelid ment by its spring 134. In such movement,

the trailing end of the surface is carried The first impulse of each signal is utilized to start the motor of the selector drum. This isaccomplished by mounting on the armature 104 the movable contact 139 of the switch 85 (Fig. 1) for closing the temporary starting circuit of the motor. The stationary con tact of this switch is disposed below the arma ture and is formed on the end of a screw 140 threadin throu h a plate 141 (Fig. 6) which projects orwar ly from an insulating block on the selector frame. Since the armature is drawn upwardly by energization of the coils 105 when no code signals are being received,

the switch 85 is normally held open. However,,when any radiant energy impulse is detected which is of sufiicient strength to cause the magnet 105 to be deenergized, the switch 85 will be closed by the action of the spring 110. This establishes the temporary energizin circuit for the motor and holds that circult closed until the grid of the vacuum tube is discharged by rotation of the selector drum sufiiciently to carry the first tooth of the wheel 127 against the follower 1 29. In the initial movement of the drum, the switch 86 is closed and the main energizing circuit for the drum motor takes control for the remainder of the signal cycle.

The selection according to the character of the received signal combination is completed I in the present instance by the use of yieldcombination disks a able stopswhich are ositioned to engage the Pter all of the code bars have been presented to the plow and just before the selector drum has com leted its revolution. Herein the stops are in the form of rollers 142 (Figs. 6, 7, 8, 10 and 11) mounted .on the freeiends of spring arms numbered 143 to 148 inclusive and secured to an insulating block 149 which is mounted on the front of the frame standards 21 and 22. Each follower rojects over the selector drum and normally bears against a limit stop 150 (Fig. 6). In this position, the rollers on the ollowers 143, 145, 146 and 148 are disposed respectively in the paths of raised cam lobes 151 on the combination disks 48 49, 50 and 51. Near the end of the si al cycle the leading ends 152 of the cam 10 es engage the rollers 142 on the followers and tend to hold the combination disks back against further rota-' tion with the drum. If at the time the combination disks are thus restrained, the code bars are set so that one notch in each bar registers with one of the combination disks thereby forming an arcuate groove, that disk will be held stationary momentarily, continued movement of the selector drum independently of the disk thus held being permitted by the groove formed by the alined notches. The limit of'such relative movement between the disk and the drum is determined by the length of its slot 52. Further movement of the selected combination disk relative to the drum is thus prevented 33, 35, 38, 3 and 40 are shifted and in the continued rotation of the drum, the follower is pressed outwardly with its roller riding along the cam lobe. As the 65. This conditioning of the combination disk for the next cycle takes place just before the movement of the drum is arrested by opening of the motor circuit. In the event that the code bars are not set in any one of the four proper combinations when the cam lobes strike the rollers 142, relative movement between the combination disks and the'stationary disks on the drum cannot take place. Under these conditions all of the folowers are .forced outwardly as soon as they are struck by the cam lobes.

Accordin to the present arrangement of notches in the code bars as shown in Figs. 14 and 15, the combination disk 48 will be freed for movement whenever the code bars 29, 31, out of normal position, the bars 41-and 42 are either shifted or not shifted and the other bars remain in normal position. If the bar 42 is also shifted and the bar 41 is not shifted by the same signal, the disk 50 will also be permitted to move. In a similar way the notches are alined to permit movement of the disk 49 when the bars 30, 32, 34, 36 and 37 are shifted while the other bars remain in normal position. The disk 51 will move simultaneously with the disk 49 when the bar 41 is also shifted and the bar 42 is not shifted.

Relative movements between the combination disks and the stationary disks are utilized respectively to operate four control devices herein illustrated as comprising four switches 153, 154, 155 and 156 (Figs. 7 and 8). The switches 153 and 154' are formed by arms 157 on the followers 143 and 145 positioned to cooperate with one of two contacts on the spring follower the insulating block 149. The switches 155 and 156 are ormed by contacts on the arm 147 cooperating with contacts on arms 158 carried by the followers 146 and 148. N ormally the arms 143 to 148 are pressed down against the stop 150 their contacts being disposed as shown in Fig. 8 with all of the switches open.

The rollers 142 carried by the arms 144 and 147 are positioned respectively in the paths of cam lobes 159' formed on the stationary disks 25 and 26. The angular position of the leading ends of these lobes is such that the rollers-142 are engaged thereby at substantially the same time the lobes 151 en age their rollers. Thus if the combination isks are locked against movement at the end of the cycle, all of the followers will be pressed 144 also secured to Closure of the switches 153 and 154 may be operators of two, different doors of a garage,

hand, if one combination disk is freed by the proper settin of the code bars to move relative to the a jacent stationary disk, its follower will be actuated-shortly after the follower actuated by the stationary disk, the result being to momentarily close the'switch controlled y the two followers whose movements thus take place successively.

structed as above described, it will be observed that switches 153 and 154- will be closed by the difl'erent settings of the code bars which free the combination disks 48 and 49 respectively. The switch 155 will be closed at the same time as the switch 153 provided the code bars 41 and 42 are properly set by the last two units of the signal so as to free the disk 50. Similarly, if a spaceunit causes the bar 41 to be pushed and an impulse allows the bar 42 to remain in normal position following the signal units which properly set the other bars to close the switch 154, the switch 156 will also be closed.

utilized to initiate" the operation of power as is disclosed in; a cogending application by Howard D. Colman, erial No. 188,856 filed May 4, 1927. Switches 155 and 156 may be 'used to control the lighting circuit in the garage in accordance with theoperation of the respective doors, a means for accomplishing this result being disclosed in my copending application Serial No. 177,555 filed March 23, 1927. 1

signal cycle may be, briefly summarized as follows: For example, by a signal composed of fifteen units of which units 1', 3, 5,7, 9, 10 and 14 are represented by radiant energy impulses while the others are space units. Upon the reception of the first signal impulse, the magnet 105 is deenergi zed which closes the switch to establish a temporary starting circuit for the motor magnet 66, thereby initiating the rotation of the selector drum which establishes the main circuit for the motor. In such rotation, each code bar notalready in normal position is shifted into normal position by the cam 97. During the reception of the remaining signal units, the

code bars 29,

31, 33, 35, 38, 39, 40 and 42 will be pushed into shifted position under the control of the space units of the signal while the bars 30, 32, 34, 36, 37 and 41 remain in normal position. Thus the bars will be arranged as shown in Fig. 14, the combination disks 48 and 50 being thereby freed for oscillation upon the drum. Near the end of the revolution when the lobes on the stationary and combination disks strike the rollers of their respective followers, the followers 144, 145, 147 and 148 willbe pressed outward- ,ly owing to the fact that the disks 25, 49, 26

and,51 areat this time rigid with the selector The operation of the selector during a drum; Disks 48 and 50, however, being free to oscillate, will be held back momentarily so that outward movement :of their followers will be delayed slightly. Since the followers 144 and 145 and the followers 147 and 148 move simultaneously switches 154, and 156 remain open. The followers 144 and 143 and followers 147 and 146, however, move suc- W th the code and combmationbars concycle being thereby terminated. This movement of the follower 89 releases the disk 133 for movement to finally terminate the last grid discharge.

I claim as my invention: 1. A selector for a signalling system comprising, in combination, a plurality of code bars mounted in parallel relation for bodily movement transversely of their lengths and for individual endwise movement into either,

of two set positions, meansoperable to eiiect such bodily movement, signal respon sive means controlling said endwise movement, a notch in each of said code bars, a'

combination member mounted for movement "perpendicular to said bars and positioned in register with the. notches in certain of said bars when the bars are in normal set position and in register with the notches in said other bars when the latter bars are in said other set position, said member being thereby locked against movement by said last mentioned group of bars when they are in normal set position and by the remaining bars when such bars are in said other set position, means operable to move said member relative to said bars when all of the notches are in register with saidmember, and a control means oper-' able in such relative movement between the member and the bars. v

2. A selector for a signalling system comprising, in combination, a rotatable drum, a plurality of code bars supported in parallel relation around said drum and adaptedfor individual movement parallel to the drum axis, signal responsive means operating in the rotation of said drum to selectively position said bars, a plurality of notches in each ofsaid bars, one notch in each bar cooperating with the corresponding notches in the other bars to provide an arcuate groove when the bars are set in a predetermined combination, a plurality of combination disks each mounted on said drum for oscillation perpendicular to the axis of said drum inthe groove formed by one of the setsof notches, all of said disks being locked against movement when the code bars are set in any other than the predetermined combinations, and a plurality of control devices each responsive to the oscillation of one of said disks.

3. A selector for a signalling system comprising, in combination, a lurality of parallel code bars sup orted' or bodily movement transversely their lengths and for individual movement into either of two set positions, a plurality of notches in each of said 10 bars, one notch in each bar cooperatin to provide an elongated groove when the ars are set in a predetermined combination, a lurality of combination elements ounted or movement along with said bars, one for each set of notches adapted to be freed for movement relative to said bars by the alinementof one set of notches, and signal controlled means controlling the individual setting of said bars. go 4. A selector for a signalling system comprising, in combination, a supporting means, a plurality of code bars mounted in said supporting means having notches therein and arranged in parallel relation for bodily movement and also for individual endwise movement into either of twoset positions, said code bars being held by said supporting means a ainst movement in a direction transversely 0 their lengths, a pusher dev'ice normally disposed in the path of the bars successively presented thereto and adapted by engagement with each bar to shift it out of normal set position or to yield and allow the bar to pass unpu'shed, a control element movable into and out of blocking relation with said pusher, and a combination member cooperating with the notches in said bars so as to be controlled in its movements by the setting of said code bars by said pusher device. 4o 5. A selector for a signalling system, comprising, in combination, a supporting means, a plurality of bars mounted 1n said supporting means and arranged in parallel relation for bodily movement transversely of their lengths and adapted for individual endwise movement only relative to the supporting means, a combination element member normally engaging certain of said bars and held thereby against movement, notches in said 5 bars cooperating when said bars are set in a predetermined combination to provide a I groove for permitting movement of said element, and signal controlled means deriving energy form the bodily movement ofsaid bars and operable to set said bars in said predetermined combination.

6. A selector for a-signalling system comprising, in combination, a plurality of notched code bars adapted for individual movement into. either of two set' positions, signal responsive means controlling the setting of said bars, two combination members associated with each of said bars and normally locked against movement relative to said bars, and a .5 pair of notches in each of said bars positioned to permit movement of only one of said members when said bars are set in one combination and to permit movement of both of said members when said bars are set in a different combination. 7o 7 A selector for a. signalling system comprising, in combination, a plurality of selecting elements, signal controlled means for selectively positioning said elements in different combinations, a pair of members controlled in their movements by the setting of said elements, one of said members being responsive to a predetermined setting of said elements and both of the members being responsive to a predetermined different setting of the elements. 7

8. A selector for a signalling system comprising, in combination, a plurality of select- 1ng elements, signal controlled means for selectively positioning said elements in difi'er- 5 cut combinations, and a control member normally held against movement by a plurality of said elements and arranged to be freed for movement in response to the setting of said elements in either of two different combinations.

9. A selector for signalling systems having, in combination, a rotatably mounted shaft, driving means for rotating said shaft through a predetermined cycle, a air of as relatively thin disks fixed upon' sai shaft and spaced apart len hwise of the shaft, a plurality of code a rs supported near their opposite ends in said disks for individual movement only relative to the 100, disks, a signal responsive device controlling the setting of said bars in the rota tion of the shaft through said cycle, and a combination element also in the form of a disk mounted on said shaft but capable of limited rotation relative thereto, said combination disk having transverse notches in itsvperipheral edge, and said code bars having portions normally entered in said notches and acting only when the code bars are set in a prede- 11o termined combination to permit independent movement of the combination disk with respect to said bars, means acting to effect such independent movement of the combination disk at the end of said cycle, and a control means operable as an incident to such independent movement. 1

10. A selector for signallingsystems comprising, in combination, a plurality of rigid code bars, a combination elementa rotary carrier on which said code bars and combination element are mounted with the code bars arranged for individual endwise movement transversely of the combination element, said code bars on the one hand and the combina- 12 tion element on the other being arranged for limited relative rotation, and said code bars having at points between their ends portions normally coacting with said combination element to permit such relative rotation only when the code bars are set in a predetermined combination, 'means operable to rotate said carrier through a predetermined operating cycle, a non-rotatable signal responsive device positioned for the successive presentation thereto of said code bars and operable to effeet the endwise movement of the latter selectively, means operable near the end of the cycle to cause said member to move independently of the code bars when the latter are set in said predetermined combination, and a control means acting as an incident to such independent movement.

In testimony whereof, I have hereunto affixed my signature. Y

\ DUNCAN J. STEWART. 

